WFE: Two changes to NewRegistration key-value rate limits #5508

Job	Run time
b (go1.21.5_2023-12-11, ./t.sh --lints --generate)	1m 49s
govulncheck (1.21.5)	28s
b (go1.21.5_2023-12-11, ./t.sh --integration && ./test/test-caa-log-checker.sh)	4m 24s
b (go1.21.5_2023-12-11, ./tn.sh --integration)	6m 38s
b (go1.21.5_2023-12-11, ./t.sh --unit --enable-race-detection)	5m 40s
vendorcheck (1.21.5)	7s
b (go1.21.5_2023-12-11, ./tn.sh --unit --enable-race-detection)	5m 27s
b (go1.21.5_2023-12-11, ./t.sh --start-py)	1m 32s
b (go1.22rc1_2023-12-20, ./t.sh --lints --generate)	48s
b (go1.22rc1_2023-12-20, ./t.sh --integration && ./test/test-caa-log-checker.sh)	4m 14s
b (go1.22rc1_2023-12-20, ./tn.sh --integration)	6m 36s
b (go1.22rc1_2023-12-20, ./t.sh --unit --enable-race-detection)	5m 13s
b (go1.22rc1_2023-12-20, ./tn.sh --unit --enable-race-detection)	5m 18s
b (go1.22rc1_2023-12-20, ./t.sh --start-py)	1m 31s
Boulder CI Test Matrix	1s
	49m 46s

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